Soyoko Sonoda (Mei Furusawa) lives alone with her quadriplegic and blind father, Tamotsu (Hidemasa Mase), who suffers from retinopathy. At 19 years old, Soyoko dreams of pursuing art studies but is unable to due to her caregiving responsibilities and financial constraints. She repeatedly applies for welfare assistance, knowing that their current situation is unsustainable. However, her applications are persistently denied due to gatekeeping tactics. 

Additionally, Soyoko exhibits symptoms of ADHD, including inattention and hyperactivity, making it challenging for her to adapt to society. One night, Tamotsu cries out in distress. Due to his remaining sexual function, Tamotsu occasionally experiences discomfort, and Soyoko, unable to bear seeing him suffer, assists him in ejaculation—a grim and unspoken agreement between the two.

A few days later, despite the insufficient welfare services available, Soyoko is dealt another blow when their trusted and kind veteran caregiver, Taguchi (Asuka Kurosawa), is reassigned. In her place, a new caregiver, Sato Kiritani (Rei Ogawa), is introduced. A newcomer to the role, Sato struggles with selective mutism. Feeling anxious and worried, Soyoko continues her part-time job at the dried fish factory, where she struggles to fit in, while attempting once again to apply for welfare assistance. 

Soyoko is informed by her caseworker, Endo (Masahiro Umeda), that he will be conducting a home visit. However, Endo unexpectedly arrives much earlier than the scheduled date, catching Soyoko off guard.

Endo discovers Soyoko’s hidden savings of 500,000 yen during the visit and demands sexual favors in exchange for keeping it secret and approving her welfare application. When Soyoko refuses, Endo forcibly assaults her.

Devastated and in a state of shock, Soyoko becomes a hollow shell of herself, abandoning her caregiving duties and skipping her part-time job. In her absence, Sato takes on the caregiving responsibilities alone.

One day, Soyoko tries to return to work but finds herself unable to feel motivated. Instead, she wanders to a nearby seaside, seeking an escape. By evening, she returns home, only to witness a horrifying scene: her father forcing Sato to perform a hand job on him. Consumed by rage, Soyoko impulsively tries to strangle her father, but Sato intervenes and manages to stop her. At that moment, Endo arrives at the house with welfare paperwork. Unable to contain her pent-up emotions any longer, Soyoko grabs a kitchen knife and approaches Endo, driven by desperation and fury...